why don't you try Beauitful fascination is better than love' or something, it's a manwha, female teacherxmale student and has 5 volumes
It's really mature btw
try yes pretty cure 5 if you can find there is a romance between nozomi and her teacher cocoda-sensei at least this was in anime but i cant find manga anywhere to read
listen to me when i say SUGAR FAMILY is the FUNNYEST manga i have ever read!!!!
highly recommend! ^^
the drawing are really pretty too, try it out and then let me know if you liked it... (pm me or something ). :-3
I searcher with category Student-Teacher on manga updates and Whoa!! search pages of 32 total. Hey customize search and see if you find any sweet ones...